Siecień postal code
Village · płocki county (powiat) · Brudzeń Duży municipality (gmina) · mazowieckie voivodeship
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The postal code for Siecień is 09-411.
Postal code – Siecień
How to address a letter or parcel in Poland?
Jan Kowalski Siecień 15 09-411 Siecień
Write the postal code in the 00-000 format on the last line, before the town name. Put the recipient's full name on the first line and the street with building and flat number on the second. For mail from abroad, add POLAND as the final line. There are no named streets in Siecień, so the second line contains the locality name and property number (e.g. Siecień 15). If the serving post office is in another locality, its name can appear next to the code on the last line.
Frequently asked questions
How do I address a letter to Siecień if it has no named streets?
Instead of a street, write the locality name and house number, e.g. “Siecień 15”. On the last line, write the postal code 09-411 and the locality or post office name.
What is the postal code for Siecień?
The postal code for Siecień is 09-411.
Which voivodeship and county is Siecień in?
Siecień (village) is in płocki county (powiat), Brudzeń Duży municipality (gmina), mazowieckie voivodeship.
Which localities are closest to Siecień?
The closest localities to Siecień are: Lasotki (1.7 km), Siecień-Rumunki (1.8 km), Żerniki (2.3 km), Cierszewo (2.6 km), Robertowo (2.6 km), Murzynowo (2.6 km). Distances are measured in a straight line between locality centres.
Localities near Siecień (płocki county)
Which county and municipality does Siecień belong to?
Siecień lies in Brudzeń Duży municipality (gmina), in płocki county (powiat), mazowieckie voivodeship, Poland. Centre of the area based on address points: 52.6127, 19.5171.
Where does this data come from?
Localities and postal codes come from the public TERYT registers (Statistics Poland), while streets, building numbers and locations come from the National Register of Boundaries (GUGiK). Data as of 12.11.2026. This site is not affiliated with Poczta Polska; for important shipments, confirm the code at a post office. More about sources